Hello everyone, I have checked on the official postfix documentation, but I have not found any explanation on how to do what I want. I am sorry if this question has been asked before.
I am using postfix with virtual users, registered in an LDAP server. So far, everything is working fine. However, some users or some programs are sending emails using a "From" email address that does not exists in the LDAP server. I would like to know how to reject emails that came from an email address not registered in the LDAP server. Obviously, I need to do that only internally, i.e. on our domain. Can anyone send me a link to the official documentation, or an example on how to do this. Thanks a lot. Andre Rodier.
